Sero-prevalence study conducted by National Center for Disease Control

The Ministry of Health and Family Welfare (MoHFW) commissioned a sero-surveillance study in Delhi. This study has been done by the National Center for Disease Control (NCDC) in collaboration with Govt of National Capital Territory of Delhi, following a rigorous multi-stage sampling study design. Study was conducted from 27th of June 2020 to 10th July 2020.

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Key-Points

For all the 11 districts of Delhi, survey teams were formed. Blood samples were collected from selected individuals after taking written informed consent and then their sera were tested for IgG antibodies and infection using COVID KAVACH ELISA approved by Indian Council for Medical Research (ICMR). It is one of the largest sero-prevalence studies conducted in the country using the ELISA testing.

21,387 samples were collected as per lab standards and were tested. The tests done help in identification of presence of antibodies in the general population. These test performed is not a diagnostic test but only provides information about past infection due to SARSCoV-2 in individuals who test positive.

Antibody testing repeatedly done over time i.e. sero-surveillance, generates important evidence for assessing the spread of the pandemic from time to time.

The results of the sero-prevalence study show that on an average, across Delhi, the prevalence of IgG antibodies is 23.48 %.